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Experimental dataset for the influence of grain size distribution on experimental volcanic lightning

Cite as:

Springsklee, Christina; Scheu, Bettina; Manga, Michael; Cigala, Valeria; Cimarelli, Corrado; Dingwell, Donald B. (2022): Experimental dataset for the influence of grain size distribution on experimental volcanic lightning. GFZ Data Services. https://doi.org/10.5880/fidgeo.2022.009

Status

I   N       R   E   V   I   E   W : Springsklee, Christina; Scheu, Bettina; Manga, Michael; Cigala, Valeria; Cimarelli, Corrado; Dingwell, Donald B. (2022): Experimental dataset for the influence of grain size distribution on experimental volcanic lightning. GFZ Data Services. https://doi.org/10.5880/fidgeo.2022.009

Abstract

This data publication provides data from 96 experiments from 2020 to 2022 in the gas-mixing lab at the Ludwig-Maximilians-Universität München (Germany). The experiments were conducted to investigate the influence of grain size distribution, especially the influence of very fines [<10 µm] on the generation of experimental volcanic lightning (VL). The influence of grain size distribution was tested for three different materials. Experimental discharges during rapid decompression were evaluated by their number and their total magnitude. The three materials used in this study are a tholeiitic basalt (TB), industrial manufactured soda-lime glass beads (GB) and a phonolitic pumice from the lower Laacher See unit (LSB). The samples were sieved into several grain size fractions, and coarse and fines were mixed to test the influence of the added fines on the discharge behaviour. For the tholeiitic basalt, the coarse grain size fraction is 180-250 µm, for the glass beads 150-250 µm and for the phonolitic pumice, two coarse grain size fractions, 180-250 µm and 90-300 µm were tested.

The experiments were carried out in a new experimental setup, a modification of the shock tube experiments first described by Alidibirov and Dingwell (1996) and its further modifications (Cimarelli et al., 2014; Gaudin & Cimarelli, 2019; Stern et al., 2019). A mixture of coarse and fine sample material is placed into an autoclave and continuously set under pressure with argon gas up to the desired decompression pressure (⁓10 MPa). Then, rapid decompression is initialized, and the sample material is ejected from the autoclave through a nozzle into a gas-tight particle collector tank. The particle collector tank is insulated from the nozzle and the ground and serves as a Faraday cage (FC). All discharges going from the erupting gas-particle mixture, the jet, to the nozzle will be recorded by a datalogger. All the discharges measured during the first 5 ms of ejection were taken into the evaluation of the discharge behaviour. The raw signals of the experiments were evaluated by a processing code developed by Gaudin and Cimarelli (2019). Additionally, the jet behaviour was recorded by a high-speed camera: the gas-exit angle and the exit angle of the gas-particle mixture were determined. The background of the high-speed video was divided into a black side and a white side. The gas-exit angle and the exit angle gas-particle-mixture were determined as the mean of the deviation angle of a straight trajectory angle of both sides.

Authors

Contact

Contributors

Fragmentation Lab (Ludwig-Maximilians-University Munich, Germany)

Keywords

ash, electric charge, Faraday cage, shock-tube, jet, rapid decompression, phonolite, tholeiite, glass beads, EPOS, multi-scale laboratories, rock and melt physical properties

GCMD Science Keywords

More Metadata

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          • affiliation: University of California, Berkeley, US
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        • title: Experimental dataset for the influence of grain size distribution on experimental volcanic lightning
      • publisher: GFZ Data Services
      • publicationYear: 2022
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        • subject: rapid decompression
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        • subject: tholeiite
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        • subject: rock and melt physical properties
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        • subject (subjectScheme=NASA/GCMD Earth Science Keywords): EARTH SCIENCE > HUMAN DIMENSIONS > NATURAL HAZARDS > VOLCANIC ERUPTIONS
        • subject (subjectScheme=NASA/GCMD Earth Science Keywords): EARTH SCIENCE > SOLID EARTH > TECTONICS > VOLCANIC ACTIVITY > ERUPTION DYNAMICS > ASH/DUST DISPERSION
        • subject (subjectScheme=NASA/GCMD Earth Science Keywords): EARTH SCIENCE > SOLID EARTH > TECTONICS > VOLCANIC ACTIVITY > ERUPTION DYNAMICS > VOLCANIC EXPLOSIVITY
        • subject (subjectScheme=NASA/GCMD Earth Science Keywords): EARTH SCIENCE SERVICES > ENVIRONMENTAL ADVISORIES > GEOLOGICAL ADVISORIES > VOLCANIC ACTIVITY
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